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        • Plan Hint Optimization - GaussDB(DWS)

          Plan Hint Optimization - GaussDB(DWS)

          Function Plan hints can be specified using the keywords such as SELECT, INSERT, UPDATE, MERGE, and DELETE, in the following format: 1 /*+ <plan hint> */ You can specify multiple hints for a query plan and separate them by spaces.

          Help > GaussDB(DWS) > Standard Data Warehouse (9.1.0.x) > GaussDB(DWS) Performance Tuning > SQL Tuning > Hint-based Tuning
        • CREATE SYNONYM - GaussDB(DWS)

          CREATE SYNONYM - GaussDB(DWS)

          The following DML statements support synonyms: SELECT, INSERT, UPDATE, DELETE, EXPLAIN, and CALL. The CREATE SYNONYM statement of an associated function or stored procedure cannot be used in a stored procedure.

          Help > GaussDB(DWS) > SQL Syntax Reference (9.1.0.x) > DDL Syntax
        • User-defined Counter List - GaussDB(DWS)

          User-defined Counter List - GaussDB(DWS)

          Response Time Difference in Unit Time delta_avg_delete_elapse Long Average DELETE Response Time Difference in Unit Time delta_max_delete_elapse Long Maximum DELETE Response Time Difference in Unit Time delta_min_delete_elapse Long Minimum DELETE Response Time Difference in Unit Time

          Help > GaussDB(DWS) > API Reference > Appendix
        • Updating Statistics - GaussDB(DWS)

          Updating Statistics - GaussDB(DWS)

          ALTER TABLE tablename DELETE STATISTICS ((column_1, column_2)); --Delete statistics about column_1 and column_2 of tablename or their statistics declaration.

          Help > GaussDB(DWS) > Performance Tuning > SQL Optimization Guide
        • GAUSS-00521 -- GAUSS-00530 - GaussDB(DWS)

          GAUSS-00521 -- GAUSS-00530 - GaussDB(DWS)

          If any of these objects exist, delete them before trying to modify the tablespace. GAUSS-00523: "could not remove directory '%s': %m" SQLSTATE: XX000 Description: Internal system error.

          Help > GaussDB(DWS) > 8.2.0 and earlier versions > Data Warehouse Service Error Codes > GAUSS-00501 -- GAUSS-00600
        • Configuring Read-Only Permissions - GaussDB(DWS)

          Configuring Read-Only Permissions - GaussDB(DWS)

          Scenario 1: Allow software developers in your enterprise to use GaussDB(DWS) resources, but do not allow them to delete the resources or perform any high-risk operations.

          Help > GaussDB(DWS) > Best Practices > Database Management
        • Constraints and Limitations - GaussDB(DWS)

          Constraints and Limitations - GaussDB(DWS)

          To resolve this problem, delete the security folder in the corresponding configuration folder and restart Data Studio. SQL Terminal Opening an SQL file containing a large number of queries may result in an 'Insufficient Memory' error. For details, see Troubleshooting.

          Help > GaussDB(DWS) > Tool Guide > Data Studio > About Data Studio
        • UPSERT - GaussDB(DWS)

          UPSERT - GaussDB(DWS)

          Similar to column storage, an update operation performed using UPSERT on an HStore Opt table in the current version involves DELETE and INSERT.

          Help > GaussDB(DWS) > Standard Data Warehouse (9.1.0.x) > Hybrid Data Warehouse > Hybrid Data Warehouse Syntax
        • UPSERT - GaussDB(DWS)

          UPSERT - GaussDB(DWS)

          Similar to column storage, an update operation performed using UPSERT on an HStore table in the current version involves DELETE and INSERT.

          Help > GaussDB(DWS) > Standard Data Warehouse (8.1.3.x) > Hybrid Data Warehouse > Hybrid Data Warehouse Syntax
        • Updating Statistics - GaussDB(DWS)

          Updating Statistics - GaussDB(DWS)

          ALTER TABLE tablename DELETE STATISTICS ((column_1, column_2)); --Delete statistics about column_1 and column_2 of tablename or their statistics declaration.

          Help > GaussDB(DWS) > Standard Data Warehouse (8.1.3.x) > GaussDB(DWS) Performance Tuning > SQL Tuning
        • Using gs_restore to Import Data - GaussDB(DWS)

          Using gs_restore to Import Data - GaussDB(DWS)

          This will delete existing data from the target database before each import and exit the import task with an error message (which is displayed after the import process is complete) before proceeding with the next import.

          Help > GaussDB(DWS) > Data Migration and Synchronization > Metadata Migration
        • Arrays - GaussDB(DWS)

          Arrays - GaussDB(DWS)

          CALL array_proc(); 10 1 10 1 10 -- Delete the stored procedure.

          Help > GaussDB(DWS) > Standard Data Warehouse (8.1.3.x) > GaussDB(DWS) Stored Procedure > GaussDB(DWS) Stored Procedure Array and Record
        • Arrays - GaussDB(DWS)

          Arrays - GaussDB(DWS)

          CALL array_proc(); 10 1 10 1 10 -- Delete the stored procedure.

          Help > GaussDB(DWS) > Standard Data Warehouse (9.1.0.x) > GaussDB(DWS) Stored Procedure > GaussDB(DWS) Stored Procedure Array and Record
        • Step 1: Creating an Initial Table and Loading Sample Data - GaussDB(DWS)

          Step 1: Creating an Initial Table and Loading Sample Data - GaussDB(DWS)

          If SS tables already exist in the current database, run the DROP TABLE statement to delete these tables first.

          Help > GaussDB(DWS) > Best Practices > Performance Tuning > Optimizing Table Structure Design to Enhance GaussDB(DWS) Query Performance
        • Transferring Data Between OBS Buckets and GaussDB (DWS) Clusters - GaussDB(DWS)

          Transferring Data Between OBS Buckets and GaussDB (DWS) Clusters - GaussDB(DWS)

          If you delete the data file in the OBS file path, you can insert data again.

          Help > GaussDB(DWS) > Best Practices > Import and Export
        • Troubleshooting - GaussDB(DWS)

          Troubleshooting - GaussDB(DWS)

          In this case, you are advised to delete the table so that you can perform operations on tables with the same name. What should I do if I cannot log in to Data Studio because the security key is cracked?

          Help > GaussDB(DWS) > Tool Guide > Data Studio
        • REVOKE - GaussDB(DWS)

          REVOKE - GaussDB(DWS)

          Failure to do so may lead to deleting rights not intended to delete, or not deleting any rights at all.

          Help > GaussDB(DWS) > SQL Syntax Reference (8.1.3.x) > DCL Syntax
        • Perform O&M User Operations - GaussDB(DWS)

          Perform O&M User Operations - GaussDB(DWS)

          String Expiration status of the O&M account Example Request Add an O&M user. https://cn-north-208-console.ulanqab.huawei.com/dws/rest-dms/v1.0/05f2cff45100d5112f4bc00b794ea08e/clusters/e7107fab-cac0-4261-916b-7f32b3053034/db-manager/om-user/action { "operation" : "addOmUser" } Delete

          Help > GaussDB(DWS) > API Reference > API Description > Managing Database Permissions
        • Quickly Locating the Tables That Cause Data Skew - GaussDB(DWS)

          Quickly Locating the Tables That Cause Data Skew - GaussDB(DWS)

          The last change time of a table is recorded only on the CN where INSERT, UPDATE, and DELETE operations are performed. Therefore, you need to query tables that are changed within the last day (the period can be changed in the function).

          Help > GaussDB(DWS) > Best Practices > Database Management > Data Skew Queries
        • Managing Logical Clusters - GaussDB(DWS)

          Managing Logical Clusters - GaussDB(DWS)

          Locate the row that contains the target elastic pool and click Edit in the Operation column to delete nodes from the elastic pool (move the selected ring from the left to the right). A host ring with CN nodes cannot be scaled in.

          Help > GaussDB(DWS) > User Guide > GaussDB(DWS) Cluster Management > Managing GaussDB(DWS) Logical Clusters
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